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[/] [zipcpu/] [trunk/] [bench/] [asm/] [cputest.c] - Blame information for rev 168

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///////////////////////////////////////////////////////////////////////////////
//
// Filename:    cputest.c
//
// Project:     Zip CPU -- a small, lightweight, RISC CPU soft core
//
// Purpose:     To test the CPU, it's instructions, cache, and pipeline, to make
//              certain that it works.  This includes testing that each of the
//      instructions works, as well as any strange instruction combinations.
//
//
// Creator:     Dan Gisselquist, Ph.D.
//              Gisselquist Technology, LLC
//
///////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2015-2016, Gisselquist Technology, LLC
//
// This program is free software (firmware): you can redistribute it and/or
// modify it under the terms of  the GNU General Public License as published
// by the Free Software Foundation, either version 3 of the License, or (at
// your option) any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// License:     GPL, v3, as defined and found on www.gnu.org,
//              http://www.gnu.org/licenses/gpl.html
//
//
///////////////////////////////////////////////////////////////////////////////
//
//
#define NULL    (void *)0
volatile        int     *const UARTTX = (volatile int *)0x010b,
        * const UART_CTRL = (int *)0x0107;
// #define      ZIPSYS
#ifdef  ZIPSYS
#define HAVE_COUNTER
volatile        int * const PIC = (volatile int *)0xc0000000;
const int       INT_UARTTX = 0x2000;
volatile        int     *const COUNTER = (volatile int *)0xc0000008;
 
#define HAVE_SCOPE
 
#else
volatile        int     * const PIC = (volatile int *)0x0102;
const int       INT_UARTTX = 0x080;
volatile        int     *const TIMER = (volatile int *)0x0104;
#define HAVE_TIMER
#endif
 
#ifdef  HAVE_SCOPE
volatile        int     *const SCOPE = (volatile int *)0x011e;
#endif
 
unsigned        zip_ucc(void);
void            zip_save_context(int *);
void            zip_halt(void);
 
asm("\t.section\t.start\n"
        "\t.global\t_start\n"
        "\t.type\t_start,@function\n"
"_start:\n"
#ifdef  HAVE_SCOPE
        "\tNOOP\n"
        "\tLOD\t286,R0\n"
        "\tROL\t16,R0\n"
        "\tTST\t0x1000,R0\n"
        "\tBZ\t_start\n"
        "\tOR\t0x0f00,R0\n"
        "\tROL\t16,R0\n"
        "\tSTO\tR0,286\n"
#endif
        "\tCLR\tR0\n"
        "\tCLR\tR1\n"
        "\tCLR\tR2\n"
        "\tCLR\tR3\n"
        "\tCLR\tR4\n"
        "\tCLR\tR5\n"
        "\tCLR\tR6\n"
        "\tCLR\tR7\n"
        "\tCLR\tR8\n"
        "\tCLR\tR9\n"
        "\tCLR\tR10\n"
        "\tCLR\tR11\n"
        "\tCLR\tR12\n"
        "\tLDI\t_top_of_stack,SP\n"
        "\tCLR\tCC\n"
        "\tMOV\tbusy_failure(PC),R0\n"
        "\tBRA\tentry\n"
"busy_failure:\n"
        "\tBUSY\n"
        "\t.section\t.text");
 
#ifdef  HAVE_COUNTER
#define MARKSTART       start_time = *COUNTER
#define MARKSTOP        stop_time  = *COUNTER
#else
#ifdef  HAVE_TIMER
#define MARKSTART       start_time = *TIMER
#define MARKSTOP        stop_time  = *TIMER
#else
#define MARKSTART
#define MARKSTOP
#endif
#endif
 
 
extern  int     run_test(void *pc, void *stack);
asm("\t.global\trun_test\n"
        "\t.type\trun_test,@function\n"
"run_test:\n"
        "\tCLR\tR3\n"
        "\tMOV\ttest_return(PC),uR0\n"
        "\tMOV\tR3,uR1\n"
        "\tMOV\tR3,uR2\n"
        "\tMOV\tR3,uR3\n"
        "\tMOV\tR3,uR4\n"
        "\tMOV\tR3,uR5\n"
        "\tMOV\tR3,uR6\n"
        "\tMOV\tR3,uR7\n"
        "\tMOV\tR3,uR8\n"
        "\tMOV\tR3,uR9\n"
        "\tMOV\tR3,uR10\n"
        "\tMOV\tR1,uR11\n"
        "\tMOV\tR1,uR12\n"
        "\tMOV\tR2,uSP\n"
        "\tMOV\t0x20+R3,uCC\n"
        "\tMOV\tR1,uPC\n"
        "\tRTU\n"
"test_return:\n"
        "\tMOV\tuR1,R1\n"
        "\tAND\t0xffffffdf,CC\n"
        // Works with 5 NOOPS, works with 3 NOOPS, works with 1 NOOP
        "\tJMP\tR0\n");
 
void    break_one(void);
asm("\t.global\tbreak_one\n"
        "\t.type\tbreak_one,@function\n"
"break_one:\n"
        "\tLDI\t0,R1\n"
        "\tBREAK\n"
        "\tLDI\t1,R1\n" // Test fails
        "\tJMP\tR0");
 
void    break_two(void);
asm("\t.global\tbreak_two\n"
        "\t.type\tbreak_two,@function\n"
"break_two:\n"
        "\tLDI\t0,R1\n"
        "\tJMP\tR0\n"
        "\tBREAK\n");
 
void    early_branch_test(void);
asm("\t.global\tearly_branch_test\n"
        "\t.type\tearly_branch_test,@function\n"
"early_branch_test:\n"
        "\tLDI\t1,R1\n"
        "\tBRA\t_eb_a\n"
        "\tBREAK\n"
"_eb_a:\n"
        "\tLDI\t2,R1\n"
        "\tBRA\t_eb_b\n"
        "\tNOP\n"
        "\tBREAK\n"
"_eb_b:\n"
        "\tLDI\t3,R1\n"
        "\tBRA\t_eb_c\n"
        "\tNOP\n"
        "\tNOP\n"
        "\tBREAK\n"
"_eb_c:\n"
        "\tLDI\t4,R1\n"
        "\tBRA\t_eb_d\n"
        "\tNOP\n"
        "\tNOP\n"
        "\tNOP\n"
        "\tBREAK\n"
"_eb_d:\n"
        "\tLDI\t5,R1\n"
        "\tBRA\t_eb_e\n"
        "\tNOP\n"
        "\tNOP\n"
        "\tNOP\n"
        "\tNOP\n"
        "\tBREAK\n"
"_eb_e:\n"
        "\tLDI\t6,R1\n"
        "\tBRA\t_eb_f\n"
        "\tNOP\n"
        "\tNOP\n"
        "\tNOP\n"
        "\tNOP\n"
        "\tNOP\n"
        "\tBREAK\n"
"_eb_f:\n"
        "\tLDI\t0,R1\n"
        "\tJMP\tR0");
 
void    trap_test_and(void);
asm("\t.global\ttrap_test_and\n"
        "\t.type\ttrap_test_and,@function\n"
"trap_test_and:\n"
        "\tLDI\t0,R1\n"
        "\tAND\t0xffffffdf,CC\n"
        "\tLDI\t1,R1\n" // Test fails
        "\tJMP\tR0");
 
void    trap_test_clr(void);
asm("\t.global\ttrap_test_clr\n"
        "\t.type\ttrap_test_clr,@function\n"
"trap_test_clr:\n"
        "\tLDI\t0,R1\n"
        "\tCLR\tCC\n"
        "\tLDI\t1,R1\n" // Test fails
        "\tJMP\tR0");
 
void    overflow_test(void);
asm("\t.global\toverflow_test\n"
        "\t.type\toverflow_test,@function\n"
"overflow_test:\n"
        "\tLDI\t0,R1\n"
        "\tLDI\t0,R3\n"         // Clear our scorecard
// First test: does adding one to the maximum integer cause an overflow?
        "\tLDI\t-1,R2\n"
        "\tLSR\t1,R2\n"
        "\tADD\t1,R2\n"
        "\tOR.V\t1,R3\n"
// Second test: does subtracting one to the minimum integer cause an overflow?
        "\tLDI\t0x80000000,R2\n"
        "\tSUB\t1,R2\n"
        "\tOR.V\t2,R3\n"
// Third test, overflow from LSR
        "\tLDI\t0x80000000,R2\n"
        "\tLSR\t1,R2\n"         // Overflows 'cause the sign changes
        "\tOR.V\t4,R3\n"
// Fourth test, overflow from LSL
        "\tLDI\t0x40000000,R2\n"
        "\tLSL\t1,R2\n"
        "\tOR.V\t8,R3\n"
// Fifth test, overflow from LSL, negative to positive
        "\tLDI\t0x80000000,R2\n"
        "\tLSL\t1,R2\n"
        "\tOR.V\t16,R3\n"
// Record our scores
        "\tXOR\t31,R3\n"
        "\tOR\tR3,R1\n"
// And return the results
        "\tJMP\tR0");
 
 
void    carry_test(void);
asm("\t.global\tcarry_test\n"
        "\t.type\tcarry_test,@function\n"
"carry_test:\n"
        "\tLDI\t0,R1\n"
        "\tLDI\t0,R3\n"
// First, in adding
        "\tLDI\t-1,R2\n"
        "\tADD\t1,R2\n"
        "\tOR.C\t1,R3\n"
// Then, in subtraction
        "\tSUB\t1,R2\n"
        "\tOR.C\t2,R3\n"
// From a right shift
        "\tLDI\t1,R2\n"
        "\tLSR\t1,R2\n"
        "\tOR.C\t4,R3\n"
        "\tLDI\t1,R2\n"
        "\tASR\t1,R2\n"
        "\tOR.C\t8,R3\n"
// Or from a compare
        "\tLDI\t0,R2\n"
        "\tCMP\t1,R2\n"
        "\tOR.C\t16,R3\n"
// Set our return and clean up
        "\tXOR\t31,R3\n"
        "\tOR\tR3,R1\n"
        "\tJMP\tR0");
 
void    loop_test(void);
asm("\t.global\tloop_test\n"
        "\t.type\tloop_test,@function\n"
"loop_test:\n"
        "\tLDI\t0,R1\n"
// Let's try a loop: for(i=0; i<5; i++)
        "\tLDI\t0,R2\n"
        "\tLDI\t0,R3\n"
        "\tCMP\t5,R2\n"
        "\tBGE\tend_for_loop_test\n"
"for_loop_test:"
        "\tADD\t1,R2\n"
        "\tADD\t1,R3\n"
        "\tCMP\t5,R2\n"
        "\tBLT\tfor_loop_test\n"
"end_for_loop_test:"
        "\tCMP\t5,R3\n"
        "\tOR.NZ\t1,R1\n"
// How about a reverse do{} while loop?  These are usually cheaper than for()
// loops.
        "\tLDI\t0,R2\n"
        "\tLDI\t5,R3\n"
"bgt_loop_test:\n"
        "\tADD\t1,R2\n"
        "\tSUB\t1,R3\n"
        "\tBGT\tbgt_loop_test\n"
        "\tCMP\t5,R2\n"
        "\tOR.NZ\t2,R1\n"
// What if we use >=?
        "\tLDI\t0,R2\n"
        "\tLDI\t5,R3\n"
"bge_loop_test:\n"
        "\tADD\t1,R2\n"
        "\tSUB\t1,R3\n"
        "\tBGE\tbge_loop_test\n"
        "\tCMP\t6,R2\n"
        "\tOR.NZ\t4,R1\n"
// Once more with the reverse loop, this time storing the loop variable in
// memory
        "\tSUB\t1,SP\n"
        "\tLDI\t0,R2\n"
        "\tLDI\t5,R3\n"
        "\tSTO\tR3,(SP)\n"
"mem_loop_test:\n"
        "\tADD\t1,R2\n"
        "\tADD\t14,R3\n"
        "\tLOD\t(SP),R3\n"
        "\tSUB\t1,R3\n"
        "\tSTO\tR3,(SP)\n"
        "\tBGT\tmem_loop_test\n"
        "\tCMP\t5,R2\n"
        "\tOR.NZ\t8,R1\n"
        "\tADD\t1,SP\n"
//
        "\tJMP\tR0\n");
 
// Test whether or not LSL, LSR, and ASR instructions work, together with their
// carry flags
void    shift_test(void);
asm("\t.global\tshift_test\n"
        "\t.type\tshift_test,@function\n"
"shift_test:\n"
        "\tLDI\t0,R1\n"
        "\tLDI\t0,R3\n"
        "\tLDI\t0,R4\n"
// Does shifting right by 32 result in a zero?
        "\tLDI\t-1,R2\n"
        "\tLSR\t32,R2\n"
        "\tOR.Z\t1,R3\n"
        "\tOR.C\t2,R3\n"
        "\tCMP\t0,R2\n"
        "\tOR.Z\t4,R3\n"
// Does shifting a -1 right arithmetically by 32 result in a -1?
        "\tLDI\t-1,R2\n"
        "\tASR\t32,R2\n"
        "\tOR.LT\t8,R3\n"
        "\tOR.C\t16,R3\n"
        "\tCMP\t-1,R2\n"
        "\tOR.Z\t32,R3\n"
// Does shifting a -4 right arithmetically by 2 result in a -1?
        "\tLDI\t-4,R2\n"
        "\tASR\t2,R2\n"
        "\tOR.LT\t64,R3\n"
        "\tOR.C\t128,R1\n"
        "\tOR\t128,R3\n" // Artificially declare passing, so as not to fail it
        "\tCMP\t-1,R2\n"
        "\tOR.Z\t256,R3\n"
// Does one more set the carry flag as desired?
        "\tASR\t1,R2\n"
        "\tOR.LT\t512,R3\n"
        "\tOR.C\t1024,R3\n"
        "\tCMP\t-1,R2\n"
        "\tOR.Z\t2048,R3\n"
// Does shifting -1 left by 32 result in a zero?
        "\tLDI\t-1,R2\n"
        "\tLSL\t32,R2\n"
        "\tOR.Z\t4096,R3\n"
        "\tOR.C\t8192,R3\n"
        "\tCMP\t0,R2\n"
        "\tOR.Z\t16384,R3\n"
// How about shifting by zero?
        "\tLDI\t-1,R2\n"
        "\tASR\t0,R2\n"
        "\tOR.C\t32768,R1\n"
        "\tOR\t32768,R3\n"
        "\tCMP\t-1,R2\n"
        "\tOR.Z\t1,R4\n"
// 
        "\tLSR\t0,R2\n"
        "\tOR.C\t131072,R1\n"
        "\tCMP\t-1,R2\n"
        "\tOR.Z\t2,R4\n"
//
        "\tLSL\t0,R2\n"
        "\tOR.C\t524288,R1\n"
        "\tCMP\t-1,R2\n"
        "\tOR.Z\t4,R4\n"
// Tally up our results and return
        "\tXOR\t7,R4\n"
        "\tXOR\t65535,R3\n"
        "\tLSL\t16,R4\n"
        "\tOR\tR4,R3\n"
        "\tOR\tR3,R1\n"
        "\tJMP\tR0");
 
int     sw_brev(int v);
asm("\t.global\tsw_brev\n"
        "\t.type\tsw_brev,@function\n"
"sw_brev:\n"
        "\tSUB\t2,SP\n"
        "\tSTO\tR2,(SP)\n"
        "\tSTO\tR3,1(SP)\n"
        "\tLDI\t-1,R2\n"
        "\tCLR\tR3\n"
"sw_brev_loop:\n"
        "\tLSL\t1,R3\n"
        "\tLSR\t1,R1\n"
        "\tOR.C\t1,R3\n"
        "\tLSR\t1,R2\n"
        "\tBZ\tsw_brev_endloop\n"
        "\tBRA\tsw_brev_loop\n"
"sw_brev_endloop:\n"
        "\tMOV\tR3,R1\n"
        "\tLOD\t(SP),R2\n"
        "\tLOD\t1(SP),R3\n"
        "\tADD\t2,SP\n"
        "\tJMP\tR0");
 
void    pipeline_stack_test(void);
asm("\t.global\tpipeline_stack_test\n"
        "\t.type\tpipeline_stack_test,@function\n"
"pipeline_stack_test:\n"
        "\tSUB\t1,SP\n"
        "\tSTO\tR0,(SP)\n"
        "\tLDI\t0,R0\n"
        "\tMOV\t1(R0),R1\n"
        "\tMOV\t1(R1),R2\n"
        "\tMOV\t1(R2),R3\n"
        "\tMOV\t1(R3),R4\n"
        "\tMOV\t1(R4),R5\n"
        "\tMOV\t1(R5),R6\n"
        "\tMOV\t1(R6),R7\n"
        "\tMOV\t1(R7),R8\n"
        "\tMOV\t1(R8),R9\n"
        "\tMOV\t1(R9),R10\n"
        "\tMOV\t1(R10),R11\n"
        "\tMOV\t1(R11),R12\n"
        "\tMOV\tpipeline_stack_test_component_return(PC),R0\n"
        // "\tLJMP\tpipeline_stack_test_component\n"
        "\tBRA\tpipeline_stack_test_component\n"
"pipeline_stack_test_component_return:\n"
        "\tCMP\t1,R1\n"
        "\tLDI.Z\t0,R1\n"
        "\tCMP\t2,R2\n"
        "\tCMP.Z\t3,R3\n"
        "\tCMP.Z\t4,R4\n"
        "\tCMP.Z\t5,R5\n"
        "\tCMP.Z\t6,R6\n"
        "\tCMP.Z\t7,R7\n"
        "\tCMP.Z\t8,R8\n"
        "\tCMP.Z\t9,R9\n"
        "\tCMP.Z\t10,R10\n"
        "\tCMP.Z\t11,R11\n"
        "\tCMP.Z\t12,R12\n"
        "\tBREV.NZ\t-1,R1\n"
        "\tLOD\t(SP),R0\n"
        "\tADD\t1,SP\n"
        "\tJMP\tR0\n"
        );
 
void    pipeline_stack_test_component(void);
asm("\t.global\tpipeline_stack_test_component\n"
        "\t.type\tpipeline_stack_test_component,@function\n"
"pipeline_stack_test_component:\n"
        "\tSUB\t13,SP\n"
        "\tSTO\tR0,(SP)\n"
        "\tSTO\tR1,1(SP)\n"
        "\tSTO\tR2,2(SP)\n"
        "\tSTO\tR3,3(SP)\n"
        "\tSTO\tR4,4(SP)\n"
        "\tSTO\tR5,5(SP)\n"
        "\tSTO\tR6,6(SP)\n"
        "\tSTO\tR7,7(SP)\n"
        "\tSTO\tR8,8(SP)\n"
        "\tSTO\tR9,9(SP)\n"
        "\tSTO\tR10,10(SP)\n"
        "\tSTO\tR11,11(SP)\n"
        "\tSTO\tR12,12(SP)\n"
        "\tXOR\t-1,R0\n"
        "\tXOR\t-1,R1\n"
        "\tXOR\t-1,R2\n"
        "\tXOR\t-1,R3\n"
        "\tXOR\t-1,R4\n"
        "\tXOR\t-1,R5\n"
        "\tXOR\t-1,R6\n"
        "\tXOR\t-1,R7\n"
        "\tXOR\t-1,R8\n"
        "\tXOR\t-1,R9\n"
        "\tXOR\t-1,R10\n"
        "\tXOR\t-1,R11\n"
        "\tXOR\t-1,R12\n"
        "\tLOD\t(SP),R0\n"
        "\tLOD\t1(SP),R1\n"
        "\tLOD\t2(SP),R2\n"
        "\tLOD\t3(SP),R3\n"
        "\tLOD\t4(SP),R4\n"
        "\tLOD\t5(SP),R5\n"
        "\tLOD\t6(SP),R6\n"
        "\tLOD\t7(SP),R7\n"
        "\tLOD\t8(SP),R8\n"
        "\tLOD\t9(SP),R9\n"
        "\tLOD\t10(SP),R10\n"
        "\tLOD\t11(SP),R11\n"
        "\tLOD\t12(SP),R12\n"
        "\tADD\t13,SP\n"
        "\tJMP\tR0\n");
 
//mpy_test
void    mpy_test(void);
asm("\t.global\tmpy_test\n"
        "\t.type\tmpy_test,@function\n"
"mpy_test:\n"
        "\tCLR\tR1\n"
        // First test: let's count multiples of 137
        "\tLDI\t137,R2\n"       // What we're doing multiples of
        "\tCLR\tR3\n"           // Our accumulator via addition
        "\tCLR\tR4\n"           // Our index for multiplication
        "mpy_137_test_loop:\n"
        "\tMOV\tR2,R5\n"
        "\tMPY\tR4,R5\n"
        "\tCMP\tR3,R5\n"
        "\tBNZ\tend_mpy_137_test_loop_failed\n"
        // Let's try negative while we are at it
        "\tMOV\tR2,R6\n"
        "\tNEG\tR6\n"
        "\tMPY\tR4,R6\n"
        "\tNEG\tR6\n"
        "\tCMP\tR3,R6\n"
        "\tBNZ\tend_mpy_137_test_loop_failed\n"
        "\tCLR\tR6\n"
        "\tTEST\t0xffff0000,R3\n"
        "\tBNZ\tend_mpy_137_test_loop\n"
        "\tADD\tR2,R3\n"
        "\tADD\t1,R4\n"
        "\tBRA\tmpy_137_test_loop\n"
"end_mpy_137_test_loop_failed:\n"
        "\tOR\t1,R1\n"
"end_mpy_137_test_loop:\n"
        // Second test ... whatever that might be
        "\tJMP\tR0\n");
 
//brev_test
//pipeline_test -- used to be called pipeline memory race conditions
void    pipeline_test(void);
asm("\t.global\tpipeline_test\n"
        "\t.type\tpipeline_test,@function\n"
"pipeline_test:\n"
        "\tSUB\t2,SP\n"
        // Test setup
        "\tLDI\t275,R2\n"
        "\tSTO\tR2,1(SP)\n"
        "\tMOV\t1(SP),R2\n"
        "\tSTO\tR2,(SP)\n"
        "\tCLR\tR2\n"
        //
        "\tMOV\tSP,R2\n"
        "\tLOD\t(R2),R2\n"
        "\tLOD\t(R2),R2\n"
        "\tCMP\t275,R2\n"
        "\tOR.NZ\t1,R1\n"
        //
        "\tMOV\tSP,R2\n"
        // Here's the test sequence
        "\tLOD\t(R2),R3\n"
        "\tLOD\t1(R2),R4\n"
        "\tSTO\tR4,1(R3)\n"
        // Make sure we clear the load pipeline
        "\tLOD\t(R2),R3\n"
        // Load our written value
        "\tLOD\t2(R2),R4\n"
        "\tCMP\t275,R4\n"
        "\tOR.NZ\t2,R1\n"
        //
        //
        // Next (once upon a time) failing sequence:
        //      LOD -x(R12),R0
        //      LOD y(R0),R0
        "\tMOV\tSP,R2\n"
        "\tMOV\t1(R2),R3\n"
        "\tSTO\tR3,1(R2)\n"
        "\tLDI\t3588,R4\n"      // Just some random value
        "\tSTO\tR4,2(R2)\n"
        "\tMOV\tR2,R3\n"
        // Here's the test sequence
        "\tLOD\t(R2),R3\n"
        "\tLOD\t1(R3),R3\n"
        "\tCMP\tR4,R3\n"
        "\tOR.NZ\t4,R1\n"
        //
        "\tADD\t2,SP\n"
        "\tJMP\tR0\n");
 
//mempipe_test
void    mempipe_test(void);
asm("\t.global\tmempipe_test\n"
        "\t.type\tmempipe_test,@function\n"
"mempipe_test:\n"
        "\tSUB\t4,SP\n"
        "\tSTO\tR0,(SP)\n"
        "\tLDI\t0x1000,R11\n"
        // Test #1 ... Let's start by writing a value to memory
        "\tLDI\t-1,R2\n"
        "\tCLR\tR3\n"
        "\tSTO\tR2,2(SP)\n"
        "\tLOD\t2(SP),R3\n"
        "\tCMP\tR3,R2\n"
        "\tOR.NZ\t1,R1\n"
        // Test #2, reading and then writing a value from memory
        "\tNOOP\n"
        "\tNOOP\n"
        "\tCLR\tR2\n"
        "\tCLR\tR3\n"
        "\tLOD\t2(SP),R2\n"     // This should load back up our -1 value
        "\tSTO\tR2,3(SP)\n"
        // Insist that the pipeline clear
        "\tLOD\t2(SP),R2\n"
        // Now let's try loading into R3
        "\tNOOP\n"
        "\tNOOP\n"
        "\tNOOP\n"
        "\tNOOP\n"
        "\tLOD\t3(SP),R3\n"
        "\tCMP\tR3,R2\n"
        "\tOR.NZ\t2,R1\n"
        //
        "\tLOD\t(SP),R0\n"
        "\tADD\t4,SP\n"
        "\tJMP\tR0\n");
 
//cexec_test
void    cexec_test(void);
asm("\t.global\tcexec_test\n"
        "\t.type\tcexec_test,@function\n"
"cexec_test:\n"
        "\tSUB\t1,SP\n"
        "\tSTO\tR0,(SP)\n"
        //
        "\tXOR\tR2,R2\n"
        "\tADD.Z\t1,R2\n"
        "\tADD.NZ\t1,R1\n"
        "\tCMP.Z\t0,R2\n"
        "\tOR.Z\t2,R1\n"
        //
        "\tLOD\t(SP),R0\n"
        "\tADD\t1,SP\n"
        "\tJMP\tR0\n");
 
// Pipeline stalls have been hideous problems for me.  The CPU has been modified
// with special logic to keep stages from stalling.  For the most part, this
// means that ALU and memory results may be accessed either before or as they
// are written to the register file.  This set of code is designed to test
// whether this bypass logic works.
//
//nowaitpipe_test
void    nowaitpipe_test(void);
asm("\t.global\tnowaitpipe_test\n"
        "\t.type\tnowaitpipe_test,@function\n"
"nowaitpipe_test:\n"
        "\tSUB\t2,SP\n"
        //
        // Let's start with ALU-ALU testing
        //      AA: result->input A
        "\tLDI\t-1,R2\n"
        "\tCLR\tR2\n"
        "\tADD\t1,R2\n"
        "\tCMP\t1,R2\n"
        "\tOR.NZ\t1,R1\n"
        //
        //      AA: result -> input B
        "\tCLR\tR2\n"
        "\tCLR\tR3\n"
        "\tADD\t1,R2\n"
        "\tCMP\tR2,R3\n"
        "\tOR.Z\t2,R1\n"
        //      AA: result -> input A on condition
        "\tXOR\tR2,R2\n"
        "\tADD.Z\t5,R2\n"
        "\tCMP\t5,R2\n"
        "\tOR.NZ\t4,R1\n"
        //      AA: result -> input B on condition
        "\tCLR\tR2\n"
        "\tXOR\tR3,R3\n"
        "\tADD.Z\t5,R2\n"
        "\tCMP\tR2,R3\n"
        "\tOR.Z\t8,R1\n"
        //      AA: result->input B plus offset
        "\tCLR\tR2\n"
        "\tXOR\tR3,R3\n"
        "\tADD\t5,R2\n"
        "\tCMP\t-5(R2),R3\n"
        "\tOR.NZ\t16,R1\n"
        //      AA: result->input B plus offset on condition
        "\tCLR\tR2\n"
        "\tXOR\tR3,R3\n"
        "\tADD.Z\t5,R2\n"
        "\tCMP\t-5(R2),R3\n"
        "\tOR.NZ\t32,R1\n"
        //
        // Then we need to do the ALU-MEM input testing
        //
        "\tCLR\tR2\n"
        "\tSTO\tR2,1(SP)\n"
        "\tLDI\t8352,R2\n"
        "\tLOD\t1(SP),R2\n"
        "\tTST\t-1,R2\n"
        "\tOR.NZ\t64,R1\n"
        // Let's try again, this time with something that's not zero
        "\tLDI\t937,R2\n"
        "\tSTO\tR2,1(SP)\n"
        "\tNOOP\n"
        "\tLOD\t1(SP),R2\n"
        "\tCMP\t938,R2\n"
        "\tOR.GE\t128,R1\n"
        "\tCMP\t936,R2\n"
        "\tOR.LT\t256,R1\n"
        // Mem output->ALU input testing
        //      Okay, we just did that as part of our last test
        // Mem output->mem input testing
        "\tLDI\t5328,R2\n"
        "\tLOD\t1(SP),R2\n"
        "\tSTO\tR2,1(SP)\n"
        "\tLOD\t1(SP),R3\n"
        "\tCMP\t937,R3\n"
        "\tOR.NZ\t512,R1\n"
        //
        "\tADD\t2,SP\n"
        "\tJMP\tR0\n");
 
//bcmem_test
void    bcmem_test(void);
asm("\t.global\tbcmem_test\n"
        "\t.type\tbcmem_test,@function\n"
"bcmem_test:\n"
        "\tSUB\t1,SP\n"
        "\tCLR\tR1\n"
        "\tCLR\tR2\n"
        "\tLDI\t-1,R3\n"
        "\tLDI\t0x13000,R4\n"
        "\tSTO\tR2,(SP)\n"
        "\tLOD\t(SP),R3\n"
        "\tCMP\tR2,R3\n"
        "\tOR.NZ\t1,R1\n"
        "\tCMP\t0x13000,R4\n"
        "\tBZ\tbcmem_test_cmploc_1\n"
        "\tSTO\tR4,(SP)\n"
"bcmem_test_cmploc_1:\n"
        "\tLOD\t(SP),R2\n"
        "\tCMP\tR2,R4\n"
        "\tOR.Z\t2,R1\n"
        "\tCLR\tR2\n"
        "\tCMP\tR2,R4\n"
        "\tBZ\tbcmem_test_cmploc_2\n"
        "\tSTO.NZ\tR4,(SP)\n"
"bcmem_test_cmploc_2:\n"
        "\tLOD\t(SP),R2\n"
        "\tCMP\tR2,R4\n"
        "\tOR.NZ\t4,R1\n"
//
        "\tADD\t1,SP\n"
        "\tJMP\tR0\n");
 
//
// The CC register has some ... unique requirements associated with it.
// Particularly, flags are unavailable until after an ALU operation completes,
// and they can't really be bypassed for the CC register.  After writeback,
// the "new" CC register isn't really available for another clock.  Trying to
// bypass this extra clock can have problems, since ... some bits are fixed,
// some bits can only be changed by the supervisor, and others can/will change
// and even have effects--like sending the CPU to supervisor mode or
// alternatively to sleep.
//
// Here, let's see if our pipeline can successfully navigate any of these
// issues.
//
void    ccreg_test(void);
asm("\t.global\tccreg_test\n"
        "\t.type\tccreg_test,@function\n"
"ccreg_test:\n"
        // First test: If we try to change the fixed bits, will they change
        // because the pipeline tries to bypass the write-back stage
        "\tCLR\tR1\n"   // We'll start with an "answer" of success
        "\tMOV\tCC,R2\n"
        "\tMOV\tR2,R4\n"        // Keep a copy
        "\tBREV\t0x0ff,R3\n"    // Attempt to change the top fixed bits
        "\tXOR\tR3,R2\n"        // Arrange for the changes
        "\tMOV\tR2,CC\n"        // Set the changes (they won't take)
        "\tMOV\tCC,R5\n"        // See if the pipeline makes them take
        "\tXOR\tR4,R5\n"        // Let's look for anything that has changed
        "\tOR.NZ\t1,R1\n"       // If anything has changed, then we fail the tst
        // 
        // Test #2: Can we set the flags?
        "\tMOV\tCC,R6\n"
        "\tOR\t15,R6\n"
        "\tMOV\tR6,CC\n"
        "\tMOV\tCC,R7\n"
        "\tAND\t15,R7\n"
        "\tCMP\t15,R7\n"
        "\tOR.NZ\t2,R1\n"
        //
        // Test #3: How about setting specific flags, and immediately acting
        // on them?
        "\tXOR\t1+R8,R8\n"      // Turn off the Z bit
        "\tOR\t1,CC\n"          // Turn on the Z bit
        "\tOR.NZ\t4,R1\n"
        //
        // Test #4: Can we load the CC plus a value into a register?
        //      I don't think so ...
        "\tJMP\tR0\n");
 
__attribute__((noinline))
void    wait(unsigned int msk) {
        *PIC = 0x7fff0000|msk;
        asm("MOV\tidle_task(PC),uPC\n");
        *PIC = 0x80000000|(msk<<16);
        asm("WAIT\n");
        *PIC = 0; // Turn interrupts back off, lest they confuse the test
}
 
asm("\nidle_task:\n\tWAIT\n\tBRA\tidle_task\n");
 
__attribute__((noinline))
void    txchr(char v) {
        wait(INT_UARTTX);
        *UARTTX = v;
}
 
__attribute__((noinline))
void    txstr(const char *str) {
        const char *ptr = str;
        while(*ptr)
                txchr(*ptr++);
}
 
__attribute__((noinline))
void    txhex(int num) {
        for(int ds=28; ds>=0; ds-=4) {
                int     ch;
                ch = (num >> ds)&0x0f;
                if (ch >= 10)
                        ch = 'A'+ch-10;
                else
                        ch += '0';
                txchr(ch);
        }
}
 
__attribute__((noinline))
void    txreg(const char *name, int val) {
        txstr(name);    // 4 characters
        txstr("0x");    // 2 characters
        txhex(val);     // 8 characters
        txstr("    ");  // 4 characters
}
 
__attribute__((noinline))
void    save_context(int *context) {
        zip_save_context(context);
}
 
__attribute__((noinline))
void    test_fails(int start_time, int *listno) {
        int     context[16], stop_time;
 
        // Trigger the scope, if it hasn't already triggered.  Otherwise,
        // if it has triggered, don't clear it.
#ifdef  HAVE_SCOPE
        *SCOPE = 0x8f000004;
#endif
 
        MARKSTOP;
        save_context(context);
        *listno++ = context[1];
        *listno++ = context[14];
        *listno++ = context[15];
#ifdef  HAVE_COUNTER
        *listno   = stop_time;
#endif
 
        txstr("FAIL!\r\n\r\n");
        txstr("Between 0x"); txhex(start_time);
                txstr(" and 0x"); txhex(stop_time); txstr("\r\n\r\n");
        txstr("Core-dump:\r\n");
        txreg("uR0 : ", context[0]);
        txreg("uR1 : ", context[1]);
        txreg("uR2 : ", context[2]);
        txreg("uR3 : ", context[3]);
        txstr("\r\n");
 
        txreg("uR4 : ", context[4]);
        txreg("uR5 : ", context[5]);
        txreg("uR6 : ", context[6]);
        txreg("uR7 : ", context[7]);
        txstr("\r\n");
 
        txreg("uR8 : ", context[8]);
        txreg("uR9 : ", context[9]);
        txreg("uR10: ", context[10]);
        txreg("uR11: ", context[11]);
        txstr("\r\n");
 
        txreg("uR12: ", context[12]);
        txreg("uSP : ", context[13]);
        txreg("uCC : ", context[14]);
        txreg("uPC : ", context[15]);
        txstr("\r\n\r\n");
 
        asm("\tBUSY");
}
 
void    testid(const char *str) {
        const int       WIDTH=32;
        txstr(str);
        const char *ptr = str;
        int     i = 0;
        while(0 != *ptr++)
                i++;
        i = WIDTH-i;
        while(i-- > 0)
                txchr(' ');
}
 
int     testlist[32];
 
void entry(void) {
        int     context[16];
        int     user_stack[256], *user_stack_ptr = &user_stack[256];
        int     start_time, i;
 
        for(i=0; i<32; i++)
                testlist[i] = -1;
 
#ifdef  HAVE_TIMER
        *TIMER = 0x7fffffff;
#endif
#ifdef  HAVE_COUNTER
        *COUNTER = 0;
#endif
 
#define STACKTEST       asm("CMP\t16108,SP\n\tHALT.NZ\n")
        STACKTEST;
 
        // *UART_CTRL = 8333; // 9600 Baud, 8-bit chars, no parity, one stop bit
        *UART_CTRL = 25; // 9600 Baud, 8-bit chars, no parity, one stop bit
        //
        STACKTEST;
 
        txstr("\r\n");
        txstr("Running CPU self-test\n");
        txstr("-----------------------------------\r\n");
 
        int     tnum = 0;
        STACKTEST;
 
        // Test break instruction in user mode
        // Make sure the break works as designed
        testid("Break test #1"); MARKSTART;
        STACKTEST;
 
        if ((run_test(break_one, user_stack_ptr))||(zip_ucc()&0x1f50))
                test_fails(start_time, &testlist[tnum]);
        STACKTEST;
 
        save_context(context);
        if (context[15] != (int)break_one+1)
                test_fails(start_time, &testlist[tnum]);
        if (0==(zip_ucc()&0x80))
                test_fails(start_time, &testlist[tnum]);
        txstr("Pass\r\n"); testlist[tnum++] = 0; // 0
 
        STACKTEST;
 
        // Test break instruction in user mode
        // Make sure that a decision on the clock prior won't still cause a 
        // break condition
        testid("Break test #2"); MARKSTART;
        if ((run_test(break_two, user_stack_ptr))||(zip_ucc()&0x1f10))
                test_fails(start_time, &testlist[tnum]);
        txstr("Pass\r\n"); testlist[tnum++] = 0; // #1
 
        // LJMP test ... not (yet) written
 
        // Test the early branching capability
        //      Does it successfully clear whatever else is in the pipeline?
        testid("Early Branch test"); MARKSTART;
        if ((run_test(early_branch_test, user_stack_ptr))||(zip_ucc()&0x01d90))
                test_fails(start_time, &testlist[tnum]);
        txstr("Pass\r\n"); testlist[tnum++] = 0; // #2
 
        // TRAP test
        testid("Trap test/AND"); MARKSTART;
        if ((run_test(trap_test_and, user_stack_ptr))||(zip_ucc()&0x01d90))
                test_fails(start_time, &testlist[tnum]);
        if ((zip_ucc() & 0x0200)==0)
                test_fails(start_time, &testlist[tnum]);
        txstr("Pass\r\n"); testlist[tnum++] = 0; // #3
 
        testid("Trap test/CLR"); MARKSTART;
        if ((run_test(trap_test_clr, user_stack_ptr))||(zip_ucc()&0x01d90))
                test_fails(start_time, &testlist[tnum]);
        if ((zip_ucc() & 0x0200)==0)
                test_fails(start_time, &testlist[tnum]);
        txstr("Pass\r\n"); testlist[tnum++] = 0; // #4
 
        // Overflow test
        testid("Overflow test"); MARKSTART;
        if ((run_test(overflow_test, user_stack_ptr))||(zip_ucc()&0x01d90))
                test_fails(start_time, &testlist[tnum]);
        txstr("Pass\r\n"); testlist[tnum++] = 0; // #5
 
        // Carry test
        testid("Carry test"); MARKSTART;
        if ((run_test(carry_test, user_stack_ptr))||(zip_ucc()&0x01d90))
                test_fails(start_time, &testlist[tnum]);
        txstr("Pass\r\n"); testlist[tnum++] = 0; // #6
 
        // LOOP_TEST
        testid("Loop test"); MARKSTART;
        if ((run_test(loop_test, user_stack_ptr))||(zip_ucc()&0x01d90))
                test_fails(start_time, &testlist[tnum]);
        txstr("Pass\r\n"); testlist[tnum++] = 0; // #7 -- FAILS
 
        // SHIFT_TEST
        testid("Shift test"); MARKSTART;
        if ((run_test(shift_test, user_stack_ptr))||(zip_ucc()&0x01d90))
                test_fails(start_time, &testlist[tnum]);
        txstr("Pass\r\n"); testlist[tnum++] = 0; // #8
 
        // MPY_TEST
        testid("Multiply test"); MARKSTART;
        if ((run_test(mpy_test, user_stack_ptr))||(zip_ucc()&0x01d90))
                test_fails(start_time, &testlist[tnum]);
        txstr("Pass\r\n"); testlist[tnum++] = 0; // #9
 
        // BREV_TEST
        //testid("BREV/stack test"); MARKSTART;
        //if ((run_test(brev_test, user_stack_ptr))||(zip_ucc()&0x01d90))
                //test_fails(start_time);
        //txstr("Pass\r\n");
 
        // PIPELINE_TEST
        testid("Pipeline test"); MARKSTART;
        if ((run_test(pipeline_test, user_stack_ptr))||(zip_ucc()&0x01d90))
                test_fails(start_time, &testlist[tnum]);
        txstr("Pass\r\n"); testlist[tnum++] = 0; // #10
 
        // MEM_PIPELINE_STACK_TEST
        testid("Mem-Pipeline test"); MARKSTART;
        if ((run_test(mempipe_test, user_stack_ptr))||(zip_ucc()&0x01d90))
                test_fails(start_time, &testlist[tnum]);
        txstr("Pass\r\n"); testlist[tnum++] = 0; // #11
 
        // CONDITIONAL EXECUTION test
        testid("Conditional Execution test"); MARKSTART;
        if ((run_test(cexec_test, user_stack_ptr))||(zip_ucc()&0x01d90))
                test_fails(start_time, &testlist[tnum]);
        txstr("Pass\r\n"); testlist[tnum++] = 0; // #12 -- FAILS
 
        // NOWAIT pipeline test
        testid("No-waiting pipeline test"); MARKSTART;
        if ((run_test(nowaitpipe_test, user_stack_ptr))||(zip_ucc()&0x01d90))
                test_fails(start_time, &testlist[tnum]);
        txstr("Pass\r\n"); testlist[tnum++] = 0; // #13
 
        // BCMEM test
        testid("Conditional Branching test"); MARKSTART;
        if ((run_test(bcmem_test, user_stack_ptr))||(zip_ucc()&0x01d90))
                test_fails(start_time, &testlist[tnum]);
        txstr("Pass\r\n"); testlist[tnum++] = 0; // #14
 
        // Illegal Instruction test
        testid("Illegal Instruction test"); MARKSTART;
        if ((run_test(NULL, user_stack_ptr))||((zip_ucc()^0x100)&0x01d90))
                test_fails(start_time, &testlist[tnum]);
        txstr("Pass\r\n"); testlist[tnum++] = 0;
 
        // Pipeline memory race condition test
        // DIVIDE test
 
        // CC Register test
        testid("CC Register test"); MARKSTART;
        if ((run_test(ccreg_test, user_stack_ptr))||(zip_ucc()&0x01d90))
                test_fails(start_time, &testlist[tnum]);
        txstr("Pass\r\n"); testlist[tnum++] = 0;
 
        txstr("\r\n");
        txstr("-----------------------------------\r\n");
        txstr("All tests passed.  Halting CPU.\n");
        zip_halt();
}
 
// To build this:
//      zip-gcc -O3 -Wall -Wextra -nostdlib -fno-builtin -T xula.ld -Wl,-Map,cputest.map cputest.cpp -o cputest
//      zip-objdump -D cputest > cputest.txt
//
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[/] [zipcpu/] [trunk/] [bench/] [asm/] [cputest.c] - Blame information for rev 168

Line No.	Rev	Author	Line
1	168	dgisselq	`///////////////////////////////////////////////////////////////////////////////`
2			`//`
3			`// Filename: cputest.c`
4			`//`
5			`// Project: Zip CPU -- a small, lightweight, RISC CPU soft core`
6			`//`
7			`// Purpose: To test the CPU, it's instructions, cache, and pipeline, to make`
8			`// certain that it works. This includes testing that each of the`
9			`// instructions works, as well as any strange instruction combinations.`
10			`//`
11			`//`
12			`// Creator: Dan Gisselquist, Ph.D.`
13			`// Gisselquist Technology, LLC`
14			`//`
15			`///////////////////////////////////////////////////////////////////////////////`
16			`//`
17			`// Copyright (C) 2015-2016, Gisselquist Technology, LLC`
18			`//`
19			`// This program is free software (firmware): you can redistribute it and/or`
20			`// modify it under the terms of the GNU General Public License as published`
21			`// by the Free Software Foundation, either version 3 of the License, or (at`
22			`// your option) any later version.`
23			`//`
24			`// This program is distributed in the hope that it will be useful, but WITHOUT`
25			`// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or`
26			`// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License`
27			`// for more details.`
28			`//`
29			`// License: GPL, v3, as defined and found on www.gnu.org,`
30			`// http://www.gnu.org/licenses/gpl.html`
31			`//`
32			`//`
33			`///////////////////////////////////////////////////////////////////////////////`
34			`//`
35			`//`
36			`#define NULL (void *)0`
37			`volatile int const UARTTX = (volatile int )0x010b,`
38			`* const UART_CTRL = (int *)0x0107;`
39			`// #define ZIPSYS`
40			`#ifdef ZIPSYS`